PSLE
Stationery Shops R and S sell files of four colours. The bar graphs show the number of files sold by each shop in April. The bar for the number blue files sold by Stationery Shop R has not been drawn.

1. Half of the files sold by Stationery Shop R were blue files. How many blue files did Stationery Shop R sell?
2. Which colour(s) of files did Stationery Shop R sell less than Stationery Shop S? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In May, Stationery Shop S sold 30 more pink files than the number of pink files sold in April. What was the percentage increase in the number of pink files sold by Stationery Shop S from April to May?

(a)
Number of pink files sold in Stationery Shop R = 180
Number of purple files sold in Stationery Shop R = 140
Number of orange files sold in Stationery Shop R = 80

Since blue files sold in Stationery Shop R is half of the files sold by Stationery Shop R, the total of pink files, purple files and orange files is equal to blue files.

Number of blue files sold in Stationery Shop R
= 180 + 140 + 80
= 400

(b)
Number of pink files sold in Stationery Shop R = 180 (More)
Number of pink files sold in Stationery Shop S = 40

Number of purple files sold in Stationery Shop R = 140 (Equal)
Number of purple files sold in Stationery Shop S = 140

Number of orange files sold in Stationery Shop R = 80 (Less) 
Number of orange files sold in Stationery Shop S = 180

Number of blue files sold in Stationery Shop R = 400 (More) 
Number of blue files sold in Stationery Shop S = 180 

Colour(s) of files that Stationery Shop R sold less than Stationery Shop S = Orange (O)

(c)
Percentage increase in the number of pink files sold by Stationery Shop S from April to May
= ³⁰₄₀ x 100%
= ³₄ x 100%
= 75%

Answer(s): (a) 400; (b) O; (c) 75%